NDLI: Effect of space charge on the energy spectrum of a multispecies ion beam

Content Provider	Springer Nature Link
Author	Paperny, V. L. Chernykh, A. A. Shklyaev, V. A.
Copyright Year	2009
Abstract	The parameters of a multispecies metal ion beam extracted with the help of a set of grids from a plasma jet of a pulsed vacuum arc are studied experimentally. It is shown that the beam contains ions with energies that are both significantly lower and higher than the expected energy E $_{ Z }$ = $$ \bar Z $$ eU $_{acc}$, where $$ \bar Z $$ is the average ion charge number and U $_{acc}$ is the extracting voltage. As a result, the mean ion energy is lower than E $_{ Z }$ and the ion energy spectrum is substantially wider than that in the plasma jet. It is found that this effect weakens with decreasing discharge current amplitude and that the shape of the spectrum depends on the accelerating voltage. Probe measurements show that, at accelerating voltages higher than 1 kV, a positive space charge forms in the drift gap, due to which the electric potential in the drift gap increases to a few hundred electronvolts. Analysis of experimental data indicates that the observed features of the ion spectrum can be attributed to the effect of the unsteady electric field of the space charge of the ion beam transported through the drift gap.
Starting Page	177
Ending Page	182
Page Count	6
File Format	PDF
ISSN	1063780X
Journal	Plasma Physics Reports
Volume Number	35
Issue Number	2
e-ISSN	15626938
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-03-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discharge in vacuum Atoms, Molecules, Clusters and Plasmas
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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